有耗媒质中线天线激励下三维异常体的散射

本文研究均匀有耗媒质中,在半波长偶极天线的场激励下,多种形状和参数的异常体的散射特性。用矩量法分别求解良导电球体散射的磁场积分方程和有限导电的长方形异常体散射的电场积分方程。讨论了与数值法有关的近似、误差和检验等问题。通过数值计算得出媒质电参数改变、散射体大小、形状以及空间位置改变时散射场变化的规律。水中金属球和介质块散射的测量结果与数值计算结果吻合较好,验证了数值模型的正确性。

THE SCATTERING OF THREE-DIMENSIONAL ANOMALOUSBODY UNDER THE EXCITATION OF LINEARANTENNA IN LOSSY MEDIA

This paper deals with scattering characteristics of anomalous bodies withvaried shapes and parameters under the excitation of the field of half-wave-length dipole antenna in the homogeneous lossy media. The integral equationfor magnetic field from the scattering of highly-conducting spheroid and theintegral equation for electric field from rectangular anomalous body with limi-ted conductivity are respetively calculated by moments method; some prob-lems related to numerical method such as approximation,error and test are dis-cussed; the regularities of variation in scattering field with the change in suchfactors as electric parameters of media and the size, shape and spatial positionof the scattering body are obtained through the numerical calculation. Themeasurement results of scattering from metallic spheroid and media mass underthe water are fairly consistent with the numerical calculations, suggesting thecorrectness of the numerical model.